Paper



Nov. 9 1926. Y 1,606,163

J.J. AN AL l PPPP R Patented Nov. 9, 1926.

UNITE vSTATES JOHN J'. GANNON, LOUIS W. MAHLE, AND FRED WELLS, 0F RITTMAN, OHIO, .AS-

'SIGNORS TO THE OHIO BOXBOARDCOMPANY, OF CLEVELAND, OHIO, A CORPORA- TIoNor omo.

Perrin.

Application mea April s, 1925. serial N0. 21,222.

In packaging certain merchandise, such as lard, butter, and other greases and fats, it is desirable to have a container which is made of a grease-proof material; also, in packaging materials, which are, from their inherent nature, apt to absorb moisture from the atmosphere, itis advisable to provide a container which is madeof a moistureproof material; it is also advisable,'in packaging 4materials which deteriorate in a humid or moist atmosphere, and which are,

moreover, of a greasy or oily nature, such as nuts and soaps, to provide a container which 1s -both grease-proof and moisturevproof; and it is the object of our inventionto roduce a material, in the nature of a -box bard, which is grease-proof, or b oth grease-proof and moisture-proof.v

Various types of papers, and of boxboard and cardboard, have been produced for providing amaterial suitable for the construction of grease-proof, moisture-proof, or both grease-proof and moisture-proof containers.

Some-of .such materialsI comprise a base of ordinary paper, or cardboard Vor boxboard,

- to onesurfacegof which is affixed, by pastr y laminated material.

sary, namely,`.production of the paper, card,

board' or boxboard, production of the moisture-proof orgrease-prof paper, and combination of these two. to form 'finished,

AMoisture-proof materialv has been produced also by pasting togethertwo `or moresheets of paper, cardboard or boxboard A with asphalt orwater glass (sodium silicate) or the like' as `the adhesive.,- This type of material, although) eiiective to prevent penetration'of water or moisture through" it, is also relatively expensive to manufacture.' i

As, distinguished. from' papers and boards ofthe types last above mentioned,ourvinven The invention consists in apaper, cardboard, boxboard, `or the like, comprising, es.

\ terial of water or moisture-proofing agents,

as we will proceed now to explain and finally claim.

The drawing represents diagrammat-ically l a surface layer or coating 1 of grease-proof or both grease-proof-and moisture-proof material, a filler l2 and a backA 3. t

The stockffor forming the vfiller isproduced in the ordinai` `iiiannerby working old newspapersand t elike in an ordinary y, y

beater, andthe stock for the back is simil'arly produced, but has added to it agents or materials for making it of a higher grade 'and better color than the filler. v

' The grease-proofstock, for forming the layer or coating 1, ispioducedl in the following manner :fPure sulphite pulp is v worked in a 'beater having, as `distinguished from ,theordinary beater, a roll of stone, preferably of basalt lava, which, in its opthe sulphite pulp instead of cutting them, as distinguished from the yoperation of the .ordinary beater having a roll with steel'fly bar'sf 'This crushing of the fibers of the stock, hydration of same incident to the beating-action, and the mechanical working of the stock bythe stone roll, so breaks up and 1 macerates the sulphite Apulp that it forms-'a grease-proof product; This operae .tion contemplates the incorporation ywith a! tion and the stock usedV (sulphite pulp) are boxboard of ordinary type, o'f a-grease-proof the same as 'are employed in the manufacboxboard in a single paper-makingopera`v tion.

' ous paper.

ture of one well-known type of pergamene- The working ofthe sulphite pulp in a eration upontthe stock, crushes the bers-of ,beater having a stone. roll, as described, has

` greaserepellent, which is not produced in tliesame stock by working it in the. ordinary' beater wherein the ordinary roll with steel fly bars is used. lIt has been found possible to produce the same change in sulphite pulp stock by Working it in a ,ball mill, or with a mortar and pestle.

This stock, formed from pure sulphite repellent, andis therefore suitable for incorporation with filler stock to form a grease-v proof paper or board. However, if 1t .is

desired/'to produce a paper or board which is both grease-proof or grease-repellent and water or moisture-proof, it is necessary t0 add to the sulphite plp stock, preferably during the beating process, a suitable wax, resin size, or. other sizing agent, which is miscble with the sulphite pulp stock. 'In theas'e of the addition to the stock of a wax, such as paraine wax, it will be found advisable, in order to produce a homogene# ous and inseparable mixture of the wax and the sulphite' pulp stock, first to .prepare an emulsion of the wax, ,and then add such emulsion to the 'sulphite pulp stock..

In forming the paper or board, o'f our invention, We-use, preferably, a cylinder machine (although our material maybe produced by the Fourdrinier process), and after the stock for the various component parts of-thepaper, above enumerated, has been suitably beaten, digested and washed, it is deposited by thel cylinders of the machine (any number of cylinders being used to produce the required thickness of paper) to form the sheet -or web. NoI particular order ofde'position df the various paper stocks inthe formation of the sheet 1s essential, but We have found that the best results are obtained either. by depositing first the pure sulphite pulp stock, then the filler, and then the back, or first the back,

then the filler, and vthen the pure sulphite pulp stock. The'sheet thus formed is theren after squeezed,dried and calendered in the usual way.

Paper or board manufacturers would probably say that it would be impossible toincorporate pure sulphite pulp stock treated to form a grease-proof product, as above described, in a board, for lthe 'reason that, being a much slower stock, (that is, one through which 'water is not easily expressed) than stock generally used in board manufacturing, the Water could not be driven from the Stock effectively, and'y the finished sheet would contain blows ory vbubbles between the sulphite pulpstock y layer or coating 'and the filler or -other layer next adjacent to it; but we have found that tirely free from blows, bubbles or other:

imperfections.

We have hereinbefore described our invention as applied to a paper or boxboar'd suitable for the formati-on of containers for va` riousl articles of merchandise, and in thus describing the invention, AWe have intended that it should be understood that the paper or boxboard is used alone for the formation of such containers andvwithout any strengthening or stitfening backing. However, the paper or board produced in accordance with our inventiony 4may be put to a variety f uses. It may be used, for example, as a lin r or back for corrugated board or fiber board, or it may be incorporated in what sknown as pasted board with asphalt, water glass, glue, or the like, as the adhesive, and will,

when thus used, produce a material which,

kboth grease-proof andmoisturel or Waterfproof.

Reference is made lto lour copending appli cation for patent for improvement in paperl making, filed April 6*, 1 925, Serial N o; 21,221

which covers the process by which the hereinbefore described paper is produced.`

' ing an integral part of it. l v

2. Paper having incorporated in it during u its formation, in the paper making machine, a layer ofA grease-proof material forming an integral part ofy it.l

3. Paper having incorporated inv it a phitey of it. Y

4. *Paper having incorporated in it a layer of grease-proof material formed of pure The invention is susceptible of variousV grease-proof material formed of pure suli pulp stock vforming an integralpart u sulphite, pulp stock forming an integral part of it.

- 5. Paper having incorporated in it a layer Iof grease-proof material comprising sulphite pulp stock treated as specified, forming an.

integral part of it.

6. Paper having incorporated in it a-layer'` of grease-proof material formed of pure sulof pergameneous material form-ing an integral part of it. i

8. Paper having incorporated in it a layer of pergameneous materialdeposited therein during the paper making process and forming an integral part of it:

9. Paper having incorporated in it asY a.

surface layer during the formation of the.

paper web a grease-proof material forming an integral part of said Web.

l0. Paper having incorporated in it as a surface coating a layer of pergameneous material deposited thereon during the paper making process and forming an integral part thereof.

ll. Paper having incorporated n it during the formation of the paper web a layer of grease-proof and moisture-proof material forming an integral part of said web.

12. Paper having incorporated in it during the formation of the paper web a layer of grease-proof and moisture-proof material comprising pure sulphite pulp stock and a moisture-proofing agent forming an ntegral part of the Web.

In testimony whereof We have hereurto set our hands this third day of April A. D.

JOHN J. GANNON. LOUIS W. MAHLE. FRED B. WELLS. 

